staging: rtl8723au: core: rtw_recv: use list_first_entry()

Use list_first_entry() instead of container_of() to simplify the code.
Signed-off-by: Geliang Tang <geliangtang@163.com>
Acked-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/core/rtw_recv.c

@@ -1522,7 +1522,7 @@ struct recv_frame *recvframe_defrag(struct rtw_adapter *adapter,
 struct recv_frame *recvframe_defrag(struct rtw_adapter *adapter,
 				    struct rtw_queue *defrag_q)
 {
-	struct list_head *plist, *phead;
+	struct list_head *phead;
 	u8 wlanhdr_offset;
 	u8 curfragnum;
 	struct recv_frame *pnfhdr, *ptmp;
@@ -1534,8 +1534,7 @@ struct recv_frame *recvframe_defrag(struct rtw_adapter *adapter,
 	pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 
 	phead = get_list_head(defrag_q);
-	plist = phead->next;
-	prframe = container_of(plist, struct recv_frame, list);
+	prframe = list_first_entry(phead, struct recv_frame, list);
 	list_del_init(&prframe->list);
 	skb = prframe->pkt;